<template>
    <a-menu :style="style" class="contextmenu" v-show="visible"
            @click="handleClick" :selectedKeys="selectedKeys"
    >
        <a-menu-item :key="item.key" v-for="item in itemList" style="color: #eeeeee;">
            <a-icon role="menuitemicon" v-if="item.icon" :type="item.icon"/>
            {{ item.text }}
        </a-menu-item>
    </a-menu>
</template>

<script>
  export default {
    name: 'Contextmenu',
    props: {
      visible: {
        type: Boolean,
        required: false,
        default: false
      },
      itemList: {
        type: Array,
        required: true,
        default: () => []
      }
    },
    data() {
      return {
        left: 0,
        top: 0,
        target: null,
        selectedKeys: []
      }
    },
    computed: {
      style() {
        return {
          left: this.left + 'px',
          top: this.top + 'px',
            background:'rgba(0,0,0,0.5) !important'
        }
      }
    },
    created() {
      window.addEventListener('mousedown', e => this.closeMenu(e))
      window.addEventListener('contextmenu', e => this.setPosition(e))
    },
    methods: {
      closeMenu(e) {
        if (this.visible === true && ['menuitemicon', 'menuitem'].indexOf(e.target.getAttribute('role')) < 0) {
          this.$emit('update:visible', false)
        }
      },
      setPosition(e) {
        this.left = e.clientX
        this.top = e.clientY
        this.target = e.target
      },
      handleClick({ key }) {
        this.$emit('select', key, this.target)
        this.$emit('update:visible', false)
      }
    }
  }
</script>

<style lang="less" scoped>
    .contextmenu {
        position: fixed;
        z-index: 1;
        border: 1px solid #9e9e9e;
        border-radius: 4px;
        box-shadow: 2px 2px 10px #aaaaaa !important;
    }
</style>
